title: High-density three-dimension graphene macroscopic objects for high-capacity removal of heavy metal ions.
abstract: The chemical vapor deposition (CVD) fabrication of high-density three-dimension graphene macroscopic objects (3D-GMOs) with a relatively low porosity has not yet been realized, although they are desirable for applications in which high mechanical and electrical properties are required. Here, we explore a method to rapidly prepare the high-density 3D-GMOs using nickel chloride hexahydrate (NiCl₂·6H₂O) as a catalyst precursor by CVD process at atmospheric pressure. Further, the free-standing 3D-GMOs are employed as electrolytic electrodes to remove various heavy metal ions. The robust 3D structure, high conductivity (~12 S/cm) and large specific surface area (~560 m²/g) enable ultra-high electrical adsorption capacities (Cd²⁺ ~ 434 mg/g, Pb²⁺~ 882 mg/g, Ni²⁺ ~ 1,683 mg/g, Cu²⁺ ~ 3,820 mg/g) from aqueous solutions and fast desorption. The current work has significance in the studies of both the fabrication of high-density 3D-GMOs and the removal of heavy metal ions.
authors.affiliation: Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu 215123, People's Republic of China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Li
authors.forename: Song
authors.initials: S
authors.lastname: Gao
authors.forename: Liqiong
authors.initials: L
authors.lastname: Wu
authors.forename: Shengqiang
authors.initials: S
authors.lastname: Qiu
authors.forename: Yufen
authors.initials: Y
authors.lastname: Guo
authors.forename: Xiumei
authors.initials: X
authors.lastname: Geng
authors.forename: Mingliang
authors.initials: M
authors.lastname: Chen
authors.forename: Shutian
authors.initials: S
authors.lastname: Liao
authors.forename: Chao
authors.initials: C
authors.lastname: Zhu
authors.forename: Youpin
authors.initials: Y
authors.lastname: Gong
authors.forename: Mingsheng
authors.initials: M
authors.lastname: Long
authors.forename: Jianbao
authors.initials: J
authors.lastname: Xu
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Wei
authors.forename: Mengtao
authors.initials: M
authors.lastname: Sun
authors.forename: Liwei
authors.initials: L
authors.lastname: Liu